Vacular bundles of dicot stem is open why
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Vacular bundles of dicot stem is open, because they do not have a cambium between xylem and phloem.
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the vascular tissue is present in the form of strands known as the vascular bundles.
Characterestics of vascular bundle of a dicot stem:
Conjoint- when xylem and phloem are present on the same radius.
Collateral- when phloem is usually present on the outerside of xylem . But in few families, for example Cucurbitaceae, Solanaceae, Apocynaceae phloem also differentiates on the inner side of xylem and this is called as internal phloem.
Open- in dicots all the cells of procambium are not differentiated into xylem and phloem and this residual meristem persists inside the vascular bundle as intrafascicular cambium. The vascular bundles with such a cambium is known as open bundles. They are characteristic of dicotyledonous stems and are capable of undergoing secondary growth.